{"id":"CVE-2026-72436","revision":"7dbb1033df65427e9f82c18a9b6da3fd","records":[{"revision":"7dbb1033df65427e9f82c18a9b6da3fd","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72436","aliases":[],"title":"netfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: ipset: Don't use test_bit() in lockless RCU readers in hash types\n\nSashiko pointed out that there are a few lockless RCU readers\nusing test_bit() which is a relaxed atomic operation and\nprovides no memory barrier guarantees. Use test_bit_acquire()\ninstead where the operation may run parallel with add/del/gc,\ni.e. is not one from the next cases\n\n- protected by region lock\n- in a set destroy phase\n- in a new/temporary set creation phase","state":0,"publishedAt":"2026-08-15T05:56:50.051+00:00","modifiedAt":"2026-10-16T18:55:24.058+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"unaffected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/netfilter/ipset/ip_set_hash_gen.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"18f84d41d34fa35d0d64bbaea01fe664553ecc06\",\n                            \"lessThan\": \"c107233d2ff4fd7cef5d02f9124b99194957a710\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"18f84d41d34fa35d0d64bbaea01fe664553ecc06\",\n                            \"lessThan\": \"6329d3a9afe715fddda0460cfa46b496d61c2fe0\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"18f84d41d34fa35d0d64bbaea01fe664553ecc06\",\n                            \"lessThan\": \"7445fe965b7d8756070a40e80f8b73348ccda1d7\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"18f84d41d34fa35d0d64bbaea01fe664553ecc06\",\n                            \"lessThan\": \"c4d257734e91bfcdc71d41843392dd6400b5bb1b\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"18f84d41d34fa35d0d64bbaea01fe664553ecc06\",\n                            \"lessThan\": \"3219d74e4536658c937fd878a327257b86ce80dd\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"18f84d41d34fa35d0d64bbaea01fe664553ecc06\",\n                            \"lessThan\": \"e4b4984e28c16406ecb318444dea4a8bf47def3e\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        }\n                    ]\n                }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"product\": \"Linux\",\n                    \"vendor\": \"Linux\",\n                    \"defaultStatus\": \"affected\",\n                    \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n                    \"programFiles\": [\n                        \"net/netfilter/ipset/ip_set_hash_gen.h\"\n                    ],\n                    \"versions\": [\n                        {\n                            \"version\": \"4.2\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"4.2\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.178\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.145\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.97\",\n                            \"lessThanOrEqual\": \"6.12.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.18.40\",\n                            \"lessThanOrEqual\": \"6.18.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.1.5\",\n                            \"lessThanOrEqual\": \"7.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"7.2\",\n                            \"lessThanOrEqual\": \"*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"original_commit_for_fix\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","score":9.8,"severity":"CRITICAL"}],"references":["https://git.kernel.org/stable/c/c107233d2ff4fd7cef5d02f9124b99194957a710","https://git.kernel.org/stable/c/6329d3a9afe715fddda0460cfa46b496d61c2fe0","https://git.kernel.org/stable/c/7445fe965b7d8756070a40e80f8b73348ccda1d7","https://git.kernel.org/stable/c/c4d257734e91bfcdc71d41843392dd6400b5bb1b","https://git.kernel.org/stable/c/3219d74e4536658c937fd878a327257b86ce80dd","https://git.kernel.org/stable/c/e4b4984e28c16406ecb318444dea4a8bf47def3e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72436","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72436","identifiers":["CVE-2026-72436"]},"retained":false,"historicalAffected":[]}],"coverage":[]}